Power magnetic planetary gear set

ABSTRACT

A power magnetic planetary gear set uses stator of a motor to provide electrically generated magnetic sections. The electrically generated magnetic sections are variable under the excitation control of coils and driver so that either the outer stator or the sun stator of the magnetic planetary gear set may be stationary and still provide self-revolutionary magnetic forces toward the planet gears disposed therebetween. The planet gears are also mounted on planet arms so as to revolve on their own axes and have orbital revolution with respect to the sun stator.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a planetary gear set, and more particularly, toa power magnetic planetary gear set using electrical stator in eitherthe outer gear and/or the sun gear.

2. Description of the Prior Art

Gear transmission mechanism is widely applied in industries for powerconveying, power generation, speed transmission, etc. A planetary gearset is a special type of gear transmission mechanism that conveys andadjusts rotational torque. Planetary gear sets are highly adaptive forimplementation in electrical vehicles, hybrid vehicles, and windturbines. Its three separate components—the sun gear, the planet gears,and the outer gear, can be arbitrarily linked to a motor or a generatorfor various designed functions. Today, magnetic gears, which are poweredby high performance magnets, have been applied in the planetary gearset. The contact-free magnetic planetary gear set may be well used inconveyers with less maintenance effort, higher reliability andminiaturizing dimension. However, when functioning, magnetic planetarygear set that uses magnets, which have invariant polarity, requires boththe outer gear and the sun gear being revolving in order to effectivelypropel the planet gears therebetween to self-revolve or orbitallyrevolve with respect to the sun gear.

SUMMARY OF THE INVENTION

To make a featured alteration on conventional planetary gear set,electrically powered magnetic gears have been introduced in theembodiments of the invention.

An embodiment of the invention includes a magnetic planetary gear set.The magnetic planetary gear set includes an outer stator, a sun gear anda plurality of planet gears. The outer stator is stationary andincluding a body and a plurality of teeth circularly arranged along aninner surface of the body. Each of the teeth includes a pole head. Oneor a plurality of neighboring pole heads is intertwined with and excitedby at least a group of coils to form a variable magnetic section. Theplurality of pole heads forms a plurality of similar variable magneticsections in interlaced polarities. The polarity of each pole head ischanged under the coil excitation control of a driver. The sun gear isdisposed at an inner center of the outer stator. The sun gear revolveson its own axis and includes a first axle and a plurality of magneticelements circularly arranged along the surface of the first axle,wherein the plurality of magnetic elements aligns with one another ininterlaced polarities. The plurality of planet gears is disposed betweenthe outer stator and the sun gear. Each planet gear includes a secondaxle and a plurality of magnetic elements circularly arranged along thesurface of the second axle. The plurality of planet gears is mounted onplanet arms.

Another embodiment of the invention includes a magnetic planetary gearset. The magnetic planetary gear set includes an outer gear, a sunstator, and a plurality of planet gears. The outer gear revolves on itsown axis and includes a body and a plurality of magnetic elementscircularly arranged along an inner surface of the body, wherein theplurality of magnetic elements aligns with one another in interlacedpolarities. The sun stator is disposed at an inner center of the outergear. The sun stator is stationary and includes a first axle and aplurality of teeth circularly arranged along the surface of the firstaxle. Each of the teeth includes a pole head. One or a plurality ofneighboring pole heads is intertwined with and excited by at least agroup of coils to form a variable magnetic section. The plurality ofpole heads forms a plurality of similar variable magnetic sections ininterlaced polarities. The polarity of each pole head is changed underthe coil excitation control of a driver. The plurality of planet gearsis disposed between the outer gear and the sun stator. Each planet gearincludes a second axle and a plurality of magnetic elements circularlyarranged along the surface of the second axle. The plurality of planetgears is mounted on planet arms.

Still another embodiment of the invention includes a magnetic planetarygear set. The magnetic planetary gear set includes an outer stator, asun stator, and a plurality of planet gears. The outer stator isstationary and includes a body and a plurality of first teeth circularlyarranged along an inner surface of the body. Each of the first teethincludes a first pole head. One or a plurality of neighboring first poleheads is intertwined with and excited by at least a group of coils toform a variable magnetic section. The plurality of first pole headsforms a plurality of similar variable magnetic sections in interlacedpolarities. The polarity of each first pole head is changed under thecoil excitation control of a first driver. The sun stator is disposed atan inner center of the outer stator. The sun stator is stationary andincludes a first axle and a plurality of second teeth circularlyarranged along the surface of the first axle. Each of the second teethincludes a second pole head. One or a plurality of neighboring secondpole heads is intertwined with and excited by at least a group of coilsto form a variable magnetic section. The plurality of second pole headsforms a plurality of variable magnetic sections in interlacedpolarities. The polarity of each second pole head is changed under thecoil excitation control of a second driver. The plurality of planetgears is disposed between the outer stator and the sun stator. Eachplanet gear includes a second axle and a plurality of magnetic elementscircularly arranged along the surface of the second axle. The pluralityof planet gears is mounted on planet arms.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a magnetic planetary gear set according toa first embodiment of the invention.

FIG. 2 is an illustration of a magnetic planetary gear set according toa second embodiment of the invention.

FIG. 3 is an illustration of a magnetic planetary gear set according toa third embodiment of the invention.

FIG. 4 is an illustration of a magnetic planetary gear set according toa fourth embodiment of the invention.

FIG. 5 is an illustration of a planet gear according to an embodiment ofthe invention.

FIG. 6 is an illustration of a planet gear according to anotherembodiment of the invention.

FIG. 7 is an illustration of an embodiment of the outer stator with poleheads spiralled on the inner surface of the body.

FIG. 8 is an illustration of an embodiment of the sun stator with poleheads spiralled on surface of the first axle.

DETAILED DESCRIPTION

Please refer to FIG. 1, which is an illustration showing a magneticplanetary gear set 1 according to a first embodiment of the invention.The magnetic planetary gear set 1 includes an outer stator 10, a sungear 20, and a plurality of planet gears 30. The outer stator 10 has acircular body 11 and a plurality of teeth 12 extending radially from thebody 11 toward an inner center 14 of the outer stator 10. The pluralityof teeth 12 is circularly arranged along an inner surface 111 of thebody 11 as shown in FIG. 1. Each tooth 12 has a pole head 121, which ispreferably arc-shaped, and all arc-shaped surfaces of the pole heads 121form a circular contour with the same inner center 14 as the outerstator 10. In various embodiments of the invention, the pole heads 121may be implemented with straight type or skew type. The skew type poleheads 121 may be made of multilayered silicon steels stacked in asimilar way as the magnetic elements arranged in FIG. 5 or FIG. 6. Theouter stator 10 is implemented as a variable electrically poweredmagnetic gear as described in detail as followed, which is stationaryand needs no additional mechanism that is used in conventional outergear. In short, the outer stator 10 functions both as a mechanical gearand a stator of a motor/generator.

The sun gear 20 is disposed at the inner center 14 of the outer stator10 and has the same center of axis as the outer stator 10. The sun gear20 includes a first axle 21 and a plurality of magnetic elements 22circularly arranged along the surface of the first axle 21. The magneticelements 22 are implemented preferably as permanent magnets aligningwith one another in interlaced polarities as shown in FIG. 1. Theplurality of planet gears 30, three in the first embodiment in FIG. 1 asan example, is disposed between the outer stator 10 and the sun gear 20.Each of the planet gears 30 includes a second axle 31 and a plurality ofmagnetic elements 32, which are implemented preferably as permanentmagnets circularly arranged along the surface of the second axle 31 andaligning with one another in interlaced polarities as shown in FIG. 1.

In the first embodiment in FIG. 1, the sun gear 20 revolves on its ownaxis, while the outer stator 10 is served as a stator of amotor/generator and provides variable magnetic sections toward theplanet gears 30. FIG. 1 shows how the outer stator 10 can providevariable magnetic sections, which shows only a portion of coils forbrevity purpose and can be easily understood by applying such knowledgeto the rest of the outer stator 10 where coils are not illustrated inthe figure. The outer stator 10 provides variable magnetic sections whenthe pole heads 121 are grouped to be excited. Either one or a pluralityof pole heads 121 can be put together as a group. For example, poleheads 121 of the teeth 12 a, 12 b, and 12 c are intertwined with thegroup of coils 13 a, pole heads 121 of the teeth 12 b, 12 c, and 12 dare intertwined with the group of coils 13 b, pole heads 121 of theteeth 12 c, 12 d, and 12 e are intertwined with the group of coils 13 c,pole heads 121 of the teeth 12 d, 12 e, and 12 f are intertwined withthe group of coils 13 d, pole heads 121 of the teeth 12 e, 12 f, and 12g are intertwined with the group of coils 13 e, and pole heads 121 ofthe teeth 12 f, 12 g, and 12 h are intertwined with the group of coils13 f. The rest of the pole heads 121 as intertwined with coils in thesame manner. In such way, every three neighboring pole heads 121 areintertwined with a group of coils. The pole heads 121 are excited byeach corresponding group of coils, which are connected to a driver 100,to form a variable magnetic section. The outer stator 10 then has aplurality of variable magnetic sections. It should be noted that all thegroups of coils are connected to the driver 100 and intertwine each oneor many pole heads 121 as a way to form each magnetic section with adesignated variable polarity, and the polarity of each pole head 121 isthen capable of being changed under the coil excitation control of thedriver 100. It should also be noted that, in the embodiments of theinvention, the plurality of variable magnetic sections formed by thepole heads 121 aligns with one another in interlaced polarities.

For example, let's say that in time interval 0, the polarity of the poleheads 121 of the teeth 12 a, 12 b, and 12 c, which are intertwined withthe group of coils 13 a, is N under the control of the driver 100, whilethe polarity of the pole heads 121 of the teeth 12 d, 12 e, and 12 f,which are intertwined with the group of coils 13 d, is S under thecontrol of the driver 100. In the next time interval, i.e., timeinterval 1, the group of coils 13 b is provided with current by thedriver 100 so that the polarity of the pole heads 121 of the teeth 12 b,12 c, and 12 d, which are intertwined with the group of coils 13 b, isnow N, where the polarity of the pole head 121 of the tooth 12 d ischanged from S to N, and the group of coils 13 e is provided withcurrent by the driver 100 so that the polarity of the pole heads 121 ofthe teeth 12 e, 12 f, and 12 g, which are intertwined with the group ofcoils 13 e, is now S, where the polarity of the pole head 121 of thetooth 12 g is supposedly changed from N to S. With such workingprinciple followed on each pole head 121, the outer stator 10 canprovide a plurality of magnetic sections with interlaced polarities thatprovides electrically generated magnetic fields and ‘moves’ clockwise orcounterclockwise.

Although examples are given as that every three neighboring pole heads121 are grouped as a variable magnetic section in the above embodiment,it should not be regarded as the limitations of the invention. In otherembodiments of the invention, implementation can also be that two ormore pole heads 121 are intertwined by a group of coils, even everysingle pole head 121 being intertwined by a group of coils.

As previously mentioned, each pole head 121 is arc-shaped and all poleheads 121 form a circular contour. The pole heads 121 face the magneticelements 32 of the planet gears 30. Since every one or more neighboringpole heads 121 are grouped to form a same variable magnetic sectionproduced by the coils and the driver 100, the magnetic elements 32 ofthe planet gears 30 are capable of being propelled or attracted by thevariable magnetic sections of the outer stator 10. The plurality ofplanet gears 30 may also be mounted on planet arms 90 as shown in FIG.1, which provides different working modes by use of the planet arms 90.For one applying environment, the planet gears 30 are propelled and/orattracted to revolve on their own axes by the variable magnetic sectionsof the outer stator 10 and/or the magnetic sections 22 of the sun gear20, when the planet arms 90 are set to fix each planet gear 30 at aposition. For another applying environment, the planet gears 30 arepropelled and/or attracted to revolve on their own axes andsimultaneously have orbital revolution with respect to the sun gear 20by the variable magnetic sections of the outer stator 10 and/or themagnetic sections 22 of the sun gear 20, when the planet arms 90 are setto allow the planet gears 30 to have displacement.

Please refer to FIG. 2, which is an illustration showing a magneticplanetary gear set 2 according to a second embodiment of the invention.In the second embodiment, the magnetic planetary gear set 2 includes anouter gear 40, a sun stator 50, and a plurality of planet gears 30. Theouter gear 40 has a circular body 41 and a plurality of magneticelements 42. The plurality of magnetic elements 42 is circularlyarranged along an inner surface 411 of the body 41 as shown in FIG. 2.The magnetic elements 42 are implemented preferably as permanent magnetsaligning with one another in interlaced polarities as shown in FIG. 2.

The sun stator 50 is disposed at the inner center 44 of the outer gear40 and has the same center of axis as the outer gear 40. The sun stator50 includes a first axle 51 and a plurality of teeth 52 extendingradially from the surface of the first axle 51. The plurality of teeth52 is circularly arranged along the surface of the first axle 51 asshown in FIG. 2. Each tooth 52 has a pole head 521, which is preferablyarc-shaped, and all arc-shaped surfaces of the pole heads 521 form acircular contour with the same inner center 44 as the outer gear 40. Theplurality of planet gears 30, like the first embodiment in FIG. 1, isdisposed between the outer gear 40 and the sun stator 50. For the secondembodiment, the sun stator 50 is implemented as a variable electricallypowered magnetic gear similar with the outer stator 10 in the firstembodiment in FIG. 1, which is stationary and needs no additionalmechanism that is used in conventional outer gear.

In the second embodiment, the outer gear 40 revolves on its own axis,the inner center 44, while the sun stator 50 is served as a stator of amotor/generator and provides similar variable magnetic sections towardthe planet gears 30. The working principle of the sun stator 50 issimilar with what is described previously about the outer stator 10 inthe first embodiment. In the second embodiment, though, every two poleheads 521 of the teeth 52 of the sun stator 50 are intertwined with andexcited by a group of coils 53 and the polarity of each pole head 521 ischanged under the excitation control of the driver 100.

With the sun stator 50 in the second embodiment, each pole head 521 isarc-shaped and all pole heads 521 form a circular contour. The poleheads 521 face the magnetic elements 32 of the planet gears 30. Sinceevery one or more neighboring pole heads 521 are grouped to form avariable magnetic section produced by the coils 53 and the driver 100,the magnetic elements 32 of the planet gears 30 are capable of beingpropelled and/or attracted to revolve on their own axes andsimultaneously have orbital revolution with respect to the sun stator 50by the variable magnetic sections of the sun stator 50 and/or themagnetic elements 42 of the outer gear 40.

Please refer to FIG. 3, which is an illustration showing a magneticplanetary gear set 3 according to a third embodiment of the invention.In the third embodiment, the magnetic planetary gear set 3 includes anouter stator 10, a sun stator 50, and a plurality of planet gears 30.Both the outer stator 10 and the sun stator 50 are implemented asvariable electrically powered magnetic gear similar with the outerstator 10 and the sun stator 50 in the previous embodiments, which arestationary and needs no additional mechanism that is used inconventional outer gear and sun gear.

Please refer to FIG. 4, which is an illustration showing a magneticplanetary gear set 4 according to a fourth embodiment of the invention.In the fourth embodiment, the magnetic planetary gear set 4 includes anouter stator 10, a sun stator 50, and a plurality of planet gears 60.Both the outer stator 10 and the sun stator 50 are implemented asvariable electrically powered magnetic gear similar with the outerstator 10 and the sun stator 50 in the previous embodiments, which arestationary and needs no additional mechanism, like motors/generators,that is used in conventional outer gear and sun gear.

The plurality of planet gears 60, three in the fourth embodiment in FIG.4 as an example, is disposed between the outer stator 10 and the sunstator 50. Each of the planet gears 60 includes a second axle 61 and aplurality of magnetic elements 62, which are preferably made offerromagnetic material and distanced with one another when circularlyarranged along the surface of the second axle 61 and are attracted bythe variable magnetic sections of the outer stator 10 and/or the sunstator 50 such that the plurality of planet gears 60 revolves on theirown axes or have orbital revolution with respect to the sun stator 50.

Please refer to FIG. 5 and FIG. 6, where FIG. 5 is an illustration of aplanet gear 70 according to an embodiment of the invention and FIG. 6 isan illustration of a planet gear 80 according to another embodiment ofthe invention. In the previous embodiments, the planet gear 30 mayfurther be implemented to have axial structure as the planet gear 70 orthe planet gear 80. For the planet gear 70, each magnetic element 72 isspiralled along the surface of the second axle 71. In FIG. 6, the planetgear 80 includes at least two circular sets of magnetic elementsadjacent to each other, each circular set having magnetic elements withinterlaced polarities. Furthermore, the magnetic elements of twoadjacent circular sets with same polarity misaligning with each other.For example, the magnetic element 84 of the circular set 83 has the samepolarity and misaligns with the magnetic element 85 of the circular set82. Additionally, such structure of magnetic elements on the planetgears 70, 80 may also be implemented on the sun gear 20 or the outergear 40 that also have many magnetic elements.

Additionally, the pole heads of each stator, such as the pole heads 121of the outer stator 10 in FIGS. 1, 3, and 4, or the pole heads 521 ofthe sun stator 50 in FIGS. 2, 3, and 4, may also be implemented to formskew slots on the stators. Please refer to FIG. 7, and FIG. 8. FIG. 7shows an illustration of an embodiment of the outer stator 10 with poleheads 121 spiralled on the inner surface 111 of the body 11, and FIG. 8shows an illustration of an embodiment of the sun stator 50 with poleheads 521 spiralled on surface of the first axle 51. The skew type poleheads increase the rotational smoothness when the planetary gear sets 1,2, 3, 4 are operating.

The invention discloses a magnetic planetary gear set that uses statorof a motor/generator to provide magnetic sections. The electricallygenerated magnetic fields from the magnetic sections are variable underthe excitation control of coils and driver so that either the outerstator or the sun stator of the magnetic planetary gear set may bestationary and still provide self-revolutionary magnetic propellingforces toward the planet gears disposed therebetween. No additionalmechanism to rotate the stators is needed in the embodiments of theinvention. The planet gears are also mounted on the planet arms, whichprovide different working modes by use of the planet arms.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A magnetic planetary gear set, comprising: an annulus gear; a sun gear disposed at an inner center of the annulus gear and configured to revolve on its own axis, wherein at least one of the annulus gear and the sun gear is stationary and comprises a plurality of teeth circularly arranged by the axis of the sun gear, wherein each of the teeth comprises a pole head, one or a plurality of neighboring pole heads is intertwined with and excited by at least a group of coils to form a variable magnetic section, the plurality of pole heads forms a plurality of similar variable magnetic sections in interlaced polarities, and the polarity of each pole head is changed under the coil excitation control of a driver; and a plurality of planet gears disposed between the annulus gear and the sun gear, each planet gear comprising an axle and a plurality of magnetic elements circularly arranged along the surface of the axle; wherein the plurality of planet gears is mounted on planet arms.
 2. The magnetic planetary gear set of claim 1, wherein the annulus gear is an outer stator, stationary and comprising a body and the plurality of teeth circularly arranged along an inner surface of the body; and the sun gear comprises a first axle and a plurality of magnetic elements circularly arranged along the surface of the first axle, wherein the plurality of magnetic elements aligns with one another in interlaced polarities.
 3. The magnetic planetary gear set of claim 2, wherein each of the plurality of teeth extends radially from the inner surface of the body toward the inner center of the outer stator.
 4. The magnetic planetary gear set of claim 2, wherein each of the pole heads is arc-shaped and facing the magnetic elements of the planet gears, and is spiralled on the inner surface of the body.
 5. The magnetic planetary gear set of claim 2, wherein the magnetic elements of the plurality of planet gears are permanent magnets aligning with one another in interlaced polarities and are capable of being propelled or attracted by the variable magnetic sections of the outer stator such that the plurality of planet gears revolves on their own axes when the planet arms are set to fix each planet gear at a position.
 6. The magnetic planetary gear set of claim 2, wherein the magnetic elements of the plurality of planet gears are permanent magnets aligning with one another in interlaced polarities and are capable of being propelled or attracted by the variable magnetic sections of the outer stator such that the plurality of planet gears revolves on their own axes and have orbital revolution with respect to the sun gear when the planet arms are set to allow the planet gears to have displacement.
 7. The magnetic planetary gear set of claim 2, wherein each of the magnetic elements of each planet gear and the sun gear is spiralled along the second axle on the surface of each corresponding second axle and along the first axle on the surface of the sun gear respectively.
 8. The magnetic planetary gear set of claim 2, wherein the plurality of magnetic elements of each planet gear and the sun gear respectively comprises at least two circular sets adjacent to each other, each circular set having magnetic elements with interlaced polarities, and magnetic elements of two adjacent circular sets with same polarity misaligning with each other.
 9. The magnetic planetary gear set of claim 2, wherein the plurality of magnetic elements of each planet gear is made of ferromagnetic material and distanced with one another when circularly arranged along the surface of the second axle of each planet gear and is attracted by the variable magnetic sections of the outer stator such that the plurality of planet gears revolves on their own axes or have orbital revolution with respect to the sun gear.
 10. The magnetic planetary gear set of claim 1, wherein the annulus gear is an outer gear, revolving on its own axis and comprising a body and a plurality of magnetic elements circularly arranged along an inner surface of the body, wherein the plurality of magnetic elements aligns with one another in interlaced polarities; and the sun gear is a sun stator being stationary and comprising a first axle and the plurality of teeth circularly arranged along the surface of the first axle.
 11. The magnetic planetary gear set of claim 10, wherein each of the plurality of teeth extends radially from the surface of the first axle, and is spiralled on the surface of the first axle.
 12. The magnetic planetary gear set of claim 10, wherein each of the pole heads is arc-shaped and facing the magnetic elements of the planet gears.
 13. The magnetic planetary gear set of claim 10, wherein the magnetic elements of the plurality of planet gears are permanent magnets aligning with one another in interlaced polarities and are capable of being propelled or attracted by the variable magnetic sections of the sun stator such that the plurality of planet gears revolves on their own axes when the planet arms are set to fix each planet gear at a position.
 14. The magnetic planetary gear set of claim 10, wherein the magnetic elements of the plurality of planet gears are permanent magnets aligning with one another in interlaced polarities and are capable of being propelled or attracted by the variable magnetic sections of the sun stator such that the plurality of planet gears revolves on their own axes and has orbital revolution with respect to the sun stator when the planet arms are set to allow the planet gears to have displacement.
 15. The magnetic planetary gear set of claim 10, wherein each of the magnetic elements of each planet gear and the outer gear is spiralled along the second axle on the surface of each corresponding second axle and along the inner surface of the body of the outer gear respectively.
 16. The magnetic planetary gear set of claim 10, wherein the plurality of magnetic elements of each planet gears and the outer gear respectively comprises at least two circular sets adjacent to each other, each circular set having magnetic elements with interlaced polarities, and magnetic elements of two adjacent circular sets with same polarity misaligning with each other.
 17. The magnetic planetary gear set of claim 10, wherein the plurality of magnetic elements of each planet gear is made of ferromagnetic material and distanced with one another when circularly arranged along the surface of the second axle of each planet gear and is attracted by the variable magnetic sections of the sun stator such that the plurality of planet gears revolves on their own axes or has orbital revolution with respect to the sun gear.
 18. The magnetic planetary gear set of claim 1, wherein the annulus gear is an outer stator, stationary and comprising a body and a plurality of first teeth circularly arranged along an inner surface of the body, wherein each of the first teeth comprises a first pole head, one or a plurality of neighboring first pole heads is intertwined with and excited by at least a group of coils to form a similar variable magnetic section, the plurality of first pole heads forms a plurality of variable magnetic sections in interlaced polarities, and the polarity of each first pole head is changed under the coil excitation control of a first driver; and the sun gear is a sun stator disposed at an inner center of the outer stator, the sun stator being stationary and comprising a first axle and a plurality of second teeth circularly arranged along the surface of the first axle, wherein each of the second teeth comprises a second pole head, one or a plurality of neighboring second pole heads is intertwined with and excited by at least a group of coils to form a similar variable magnetic section, the plurality of second pole heads forms a plurality of variable magnetic sections in interlaced polarities, and the polarity of each second pole head is changed under the coil excitation control of a second driver.
 19. The magnetic planetary gear set of claim 18, wherein each of the plurality of first teeth extends radially from the inner surface of the body toward the inner center of the outer stator, and each of the plurality of second teeth extends radially from the surface of the first axle.
 20. The magnetic planetary gear set of claim 18, wherein each of the first pole heads and the second pole heads is arc-shaped and facing the magnetic elements of the planet gears.
 21. The magnetic planetary gear set of claim 18, wherein the magnetic elements of the plurality of planet gears are permanent magnets aligning with one another in interlaced polarities and are capable of being propelled or attracted by the variable magnetic sections of the outer stator or the sun stator such that the plurality of planet gears revolves on their own axes when the planet arms are set to fix each planet gear at a position.
 22. The magnetic planetary gear set of claim 18, wherein the magnetic elements of the plurality of planet gears are permanent magnets aligning with one another in interlaced polarities and are capable of being propelled or attracted by the variable magnetic sections of the outer stator or the sun stator such that the plurality of planet gears revolves on their own axes and has orbital revolution with respect to the sun stator when the planet arms are set to allow the planet gears to have displacement.
 23. The magnetic planetary gear set of claim 18, wherein each of the magnetic elements of each of the planet gears is spiralled along the second axle on the surface of each corresponding second axle.
 24. The magnetic planetary gear set of claim 18, wherein the plurality of magnetic elements of each of the planet gears comprises at least two circular sets adjacent to each other, each circular set having magnetic elements with interlaced polarities, and magnetic elements of two adjacent circular sets with same polarity misaligning with each other.
 25. The magnetic planetary gear set of claim 18, wherein the plurality of magnetic elements is made of ferromagnetic material and distanced with one another when circularly arranged along the surface of the second axle and is attracted by the variable magnetic sections of the outer stator or the sun stator such that the plurality of planet gears revolves on their own axes or has orbital revolution with respect to the sun gear.
 26. The magnetic planetary gear set of claim 25, wherein the plurality of magnetic elements of each planet gear is spiralled on the surface of the second axle. 